Swab



Aug. 17 1926. v-

' L. W. COLTON ET AL SWAB File oc 12, 1923 2 Sheets-Sheet 2 rte - L hfdbkakz Patented Aug. 17, 1926.

LAWRENCE w. COLTON, JOSEPH BEACH, CALIFORNIA; SAID L COOKE.

LA roars, AND THEODORE w. cooKn, or none A roars ASSIGNOR"TO SAID GOLTON AND SAID SWAB.

Application filed October 12, 1923., Serial No. 668,073.

This invention relates to deep well ap paratus and more particularly to swabs. V

LThe general object of the present invention is to provide a the same time practicable and simple swab; also to prov de a swab including oneor more compressible and expanslble packing mem- Mounted upon bers,

with means for securing the same at any point on their supporting stem, and for compressing them so as to make a tightsliding fit in a well casing or pump tube.

Further objects of the invention will appear hereinafter.

The inventionconsists in the novel parts and combinations of parts to be described hereinafter, all of which contribute to produce an efficient swab.

A preferred embodiment of the invention is described in the following specification,

while the broad scope of the invention is pointed out in the appended claims.

In the drawings Figure 1 is shown as arranged section.

Fig. 2

a side elevation of the swab 1n a caslng indicated in is a perspective of one of the expansible packing members.

Fig. 3 is a perspectlve of a packing member thimble.

Fig. 4 is a central longitudinal section of the upper portion of the swab, and

Fig. 5 is a similar view of the lower portion of the swab.

Swabs of the kind herein concerned include a piston-like apparatus having a valve so that when the piston or plunger is lowered, liquid in the well will pass up beyond the valve and then when the plunger or pis ton is pulled, a column of the liquid will be carried up thereby.

In practicing our tubular central body erably corrugated or threaded externally 3 substantially throughout its length.

invention we provide a or stem 2 which is prefat On the lower end is provided a guide & having an open lower end to provide for inflow of liquid in the well into the tubular body 2 and up past a check valve 5 in the form of a ball arranged in a cage 6, which is threaded at 7 on a head block 8, threaded at 9 on the upper end of the body The stem 2 is preferably imperforate.

ing sleeves 10,

it is one or more elastic packpreferably made of rubber of highly efficient and at a suitable degree of density; at their inner sides these sleeves engage the threads of the stem. The outer cylindrical surface10 of each stem is set firmly against the tubing or casing C, Figurel, in the well to be swabbed.

The packing members 10 are adapted to be;

compressed longitudinally and therefore expanded laterally so as to take up wear and maintain a good tight joint in the pipe, tube or casing C.

e provide means for compressing them. 7

It is preferable to employ a plurality of packing members mounted in a series on the stem. This'is a most advantageous construction because, as frequently happens, particularly in wells drilled by the rotary method, the tubing is not preferably straight and has bends in it. In moving a long sleeved swab past sucha bend there is a tendency for it to stick, and when a short swab moves between the sleeves past such a bend the bend is apt to cause swab readily passes through such a bend I because it accommodates itself readily to the bent form of the tube, and therefore more effectively prevents leakage past the swab at such a point. Furthermore, by employing a plurality of packing members I can obtain an increased swabbing area without being obliged to make the length of the packing member so great as to interfere with effectively securing it to the stem.

A practical and effective form of means for compressing and expanding the packer members 10 consists of thimbles 11, one against each end of each packer, these latter being provided with reduced end portions 1O fitting inside the thimbles 11. The thimbles are designed to slide freely over the threaded body 2 and are set up by tube or casing C and therefore prevent the escape of liquid" in the casing when the SWilb'lS being pulledup after it has-been lowered to the desired degree to trap a-body of thejliquid in the casing; C.

variations may be resorted to Within the principle of the invention.

What is claimed is:

1. A swab for Welltubi'ngcom'prising a central tubular stem, an elastic pack ng membei i'noun ted'e'ri said stem, sz iid-fste'm being" corri'ig'ated on its outer surface all along the place where the packing member is: mounted, and means. circumferenti'ally embracing-the upper endoi said packing mein+ b er. g

2; A swab for Well tubing; comprising a ceri 51 tubular stein, an' elastic packing niember mountedcn said stein; said stern'being threaded all along the plac'e-Wherethe packing I member is nioi'inted, and means ineluding threaded members and *members cir- 5 externally; expansible Further embodiments, modifications and erating on the threaded stem to clamp the thimbles against the packing members.

4. A swab for deep well operations including a tubular central stem threaded packing members mo unted "on *thewsaid stem," the packinggmembers being arranged so that their entire inher surfaces are in contact With the threaded portions of the stem, thnnbles mounted on the-steintc-'separately engage both ends of each packing member, and threaded memb'ers onerating, on the" threacle'd" stem" to clamp the thiinblesmembers, one cf said threaded members -being Ieeated between each two adj agent think bles t'o compress and expand each packiiig memberindependently of the other p'a'ckin'g members;

5. Iii a swab for" deep Well operations," (fOHlblHEltlC-ll" of an imperfbr'ate tubiw lar central stem thr'e'aded externally, a: (it ex'pansible packing members the plurality" mciuited c-n the st'em and engaging the threads of the, stern plurality of tliin'ible's mounted onv the stem operating to 'enga ge both ends. of the pack members, and threaded members mount M g I g some of which threaded?members are located between said.

ed on the threaded st'ent packing members independently eX'p'and ing the packing member's.-

In testimoiiy wherecfe' have signedbur' names to this specificaticn; 7 LAWRENCE W. GOLTON. JOSEPH 13A PORTE.- THEODORE W. COOKE.

against the" paekingi at their inner sides; a 

